The Hyborian Age
If your players are not too familiar with Conan's world, try the Hyborian Age via CONAN THE ROLEPLAYING GAME.
Mongoose just stopped producing for the line, so you can find any books you want at a discount. The world is low magic, human centric, and, chances are, none of your players have ever seen any of the monsters they'll encounter in a Conan game.
I've started a campaign centered around Cimmerian Barbarians, like Conan, but this game can have a lot of different "feels" and "atmospheres" depending on where you set it.
Want a celtic barbarian vibe? Set your game in Cimmeria, the way I have (
CIMMERIAN BLOOD.
Want a nordic, Viking vibe? Try out a game starting in Nordheim with the players as either the blond haird Aesir or the red haired Vanir.
Want a pirate, sea-going based game? Set your game in one of the many coastal towns, on the Great Western Ocean or even the Vilayet Sea.
Want a sandy, dark Egyptian vibe? Consider a game set around dark hearted Stygia.
Want an ancient Roman or Greek vibe? Pick any of the Hyborian nations, especially Corinthia or Argos.
Want a spanish flair with duels and nobles and knights in full plate? Pick Zingara as your starting point.
Want a edge-of-civilization vibe? Fight the Picts on the Aquilonian border.
Want a fantasy Asia/Oriental/China based vibe? Set your game in Khitai.
Want a Turkish or ancient Indian vibe? Look to Turan and Vendya.
Want a deep, dark, ancient African vibe? Try the Black Kingdoms.
Want a game set with the players as part of, or leading, a mercenary company? Set the game around a Free Company.
Want a land where sorcery is dark and unspeakable rites are performed? Try Hyperborea or Zamora.
Want a land of petty warlords, city-state kings, and wandering bands of mauraders? Try the Border Kingdom.
Want a land set in a land similar to England in the 1100's after Rome retreated? Look to Brythunia.
I could go on. The point is, the Hyborian Age is as different and regional as the real world. In fact, it is supposed to be the real world some 10,000 years ago after Atlantis sank beneath the waves.
I would suggest you get the [ame=http://www.amazon.com/Conan-Return-Road-Kings-Roleplaying/dp/1905850085/ref=sr_1_2?s=books&ie=UTF8&qid=1283823500&sr=1-2]RETURN TO THE ROAD OF KINGS[/ame] supplement and decide where you want to set/start your game, then buy supplements that compliment that choice.
Conan's world is rich in detail, dark in sorcery, gritty in combat, and addiciting to play in.
